David Steinberg — who appeared on “The Tonight Show Starring Johnny Carson” 140 times, only second to Bob Hope — has sold a new book, tentatively titled “Talking Funny.”

The tome, which will reveal Steinberg’s comedic secrets, was sold in an auction to Alfred Knopf and editor Victoria Wilson, we hear.

Steinberg — who directed episodes of HBO’s “Curb Your Enthusiasm” and hosts Showtime’s “Inside Comedy” — has also just signed on as exec producer of a newly revamped “Cash Cab” for Discovery and Lion USA, which starts shooting in NYC in June.

He just directed the second episode of “Curb’s” ninth season starring Larry David.